• [Wiki] http://en.wikipedia.org/wiki/Lanius_tephronotus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=DB5F260945B6BD00&sec=lifehistory.
• [FanGao2021] Fan, L., Gao, L., Zhu, Z., Zhang, X., Zhang, W., Zhang, H., Li, J., and Du, B. (2021). The grey-backed shrike parents adopt brood survival strategy in both the egg and nestling phases. Avian Res, 12:11:1--10. doi:10.1186/s40657-021-00244-x.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PrinPres1991] Prinzinger, R., A.Preßmar, and Schleucher, E. (1991). Body temperature in birds. Comp. Biochem. Physiol., 99A(4):499--506. doi:10.1016/0300-9629(91)90122-S.